Which molecule stores genetic information in most organisms?

• A. RNA
• B. Lipid
• C. Protein
• D. DNA

Answer: (D)

DNA stores genetic information because it provides a stable, heritable blueprint encoded in the sequence of nucleotides. Its double-helix structure, with specific base pairing (A with T, G with C), lets information be copied accurately during cell division and repaired when damaged. This reliable storage is what makes DNA the long-term repository of hereditary instructions that determine traits across generations. While RNA plays essential roles in reading and using that information (as messenger or functional RNA) and some viruses use RNA as their genome, the typical cellular organization of life relies on DNA as the main genetic material. Lipids store energy and form membranes, and proteins carry out functions, but they do not serve as the durable, universal store of genetic information.